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Question

In prairie chickens the gene for throat sac size shows simple dominant-recessive inheritance. A recessive allele causes small throat sacks and a dominant allele causes large throat sacks. In a certain population of chickens, 264 chickens show the recessive phenotype and 788 chickens show the dominant phenotype.
What is the frequency of the homozygous recessive genotype?

A
0.75
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B
0.5
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C
0.25
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D
1
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Solution

The correct option is C 0.25
In the prairies,
264 chickens show recessive phenotypes
788 chicken show dominant phenotypes (both heterozygous and homozygous)
total number of chickens is 1052
the chickens with recessive condition is almost 1/4th of the total number of progenies
So, the frequency of the recessive genotype is 0.25
So, the correct answer is '0.25'

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